Malicious RTF — malware analysis report

Static analysis result for SHA-256 f15cbbfe4305f58f…

MALICIOUS

RTF

276.4 KB Authoring application: Riched20 6.3.9600 First seen: 2021-06-17
MD5: e211f8bf015cc3899708762b8056ab4d SHA-1: d966daa7c49fe2f730daa08747e368ce335b24ed SHA-256: f15cbbfe4305f58f8b45b527468c0ba42b9669428c2e413a07f8cdc841967910
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object specifically identified as Equation Editor, triggering critical heuristics related to CVE-2018-0802. This indicates the file is designed to exploit this vulnerability for client-side code execution. The ClamAV detection further confirms the malicious nature, pointing to a known exploit. Given the nature of the exploit, it is highly likely delivered via spearphishing.

Heuristics 6

  • ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • Equation Editor ProgID + OLE object high RTF_EQUATION_EDITOR
    RTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000100.bin rtf-objdata-decoded RTF \objdata at offset 0x100 17165 bytes
SHA-256: 08e21ee98d890273bb04664edb1baa2b4268e3f4f9c14f528843e6fe2f624d99

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